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[DAGCombine] (A+C1)-C2 -> A+(C1-C2) constant-fold

Authored by lebedev.ri on May 30 2019, 12:27 PM.

Description

[DAGCombine] (A+C1)-C2 -> A+(C1-C2) constant-fold

Summary:
Direct sibling of D62662, the root cause of the endless combine loop in D62257

https://rise4fun.com/Alive/d3W

Reviewers: RKSimon, craig.topper, spatel, t.p.northover

Reviewed By: t.p.northover

Subscribers: t.p.northover, javed.absar, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62664

llvm-svn: 362133